Air Conditioner BTU Calculator
Fill in the values and the answer updates as you type.
How the Air Conditioner BTU Calculator works
The base load is about 215 BTU/h per m² for a 2.4 m ceiling, scaled by ceiling height and adjusted 10% down for shade or up for strong sun. Each person beyond the first adds 600 BTU/h and appliances add 3.412 BTU/h per watt. One ton of cooling is 12,000 BTU/h. Climate, insulation, and window area change real needs. Example: with the default values, cooling needed comes to 6,461 BTU/h.
Inputs and results
The Air Conditioner BTU Calculator takes 5 inputs and gives 4 results.
What you enter
- Room floor area (m²) — starts at 20.
- Ceiling height (m) — starts at 2.7.
- Sun exposure — starts at Average. Choose from: Shaded, Average and Very sunny.
- People usually in the room — starts at 2.
- Heat-producing appliances (W) — starts at 300.
What you get
- Cooling needed (BTU/h)
- Nearest standard size (BTU/h)
- Cooling needed (kW)
- Cooling needed (tons)
Example: Air Conditioner BTU Calculator with the starting values
With room floor area 20 m², ceiling height 2.7 m, sun exposure Average, people usually in the room 2 and heat-producing appliances 300 W, the calculator returns:
| Cooling needed (BTU/h) | 6,461 |
|---|---|
| Nearest standard size (BTU/h) | 7,000 |
| Cooling needed (kW) | 1.9 |
| Cooling needed (tons) | 0.54 |
Change any value above and the results update straight away.
Air Conditioner BTU Calculator FAQ
How do I use the Air Conditioner BTU Calculator?
Enter room floor area, ceiling height, sun exposure and people usually in the room in the fields, then read cooling needed (btu/h), nearest standard size (btu/h), cooling needed (kw) and cooling needed (tons) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Air Conditioner BTU Calculator calculate?
Cooling capacity needed for a room. It returns cooling needed (btu/h), nearest standard size (btu/h), cooling needed (kw) and cooling needed (tons) from the 5 values you provide.
What values does the Air Conditioner BTU Calculator start with?
It opens with room floor area 20 m², ceiling height 2.7 m, sun exposure Average and people usually in the room 2 so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Air Conditioner BTU Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Air Conditioner BTU Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.